Did they specifically compose this song for Naruto?

If they didn't it was a great pick for them to make as the second ending.

I know a lot of fans in the anime forum didn't like it, but they don't realize how much the lyrics to this song foreshadowed what is coming up.

"Light was born, then darkness was born, the two are one"

The manga chapter where Naruto and Gaara fight, is called Two Boys, the Light and the Dark after all.

I hope they play Harmonia during the conclusion of the battle when both of them are just beat.